Light Stax Illuminated Blocks Mega Set, 102 Pieces LIGHT IT UP: Build masterpieces like never before with these light up blocks that connect to the battery or USB powered base. WONDERFUL DESIGN: This set is ideal for hands on kids who love bright lights and colors for their sensory development. LITTLE ARCHITECT: If you want to start your architect or engineer early, get their mind building at an early age to stimular constructive growth. CREATIVE DEVELOPMENT: Imagination is one of the most fundamental parts of the brain. Get it working with a building set where their mind is the limit. QUALITY MADE: These blocks snap together and come apart easily, but stay secure where intended. Durably constructed, they're fantastic use after use.